Hoist



Feb. 5, 1935. 1 BLACKBURN Er AL v I 1,990,163

Filed Jan. 18, 1955 2 sheets-sheet 1 Feb. 5, 1935.

J. BLACKBURN ET AL HoIsT Filed Jan. 18, 1953 2 snelste-sheet 2 PatentedFeb. 5, 1935 v UNlTll'l)v STATES PATE T OFFICE HOIST Jasper Blackburnand JamesA. Weaver, Jr., y Webster' Groves, Mo.

Application January 18,1933, SerialNo. 652,272

z claims.- (o1. 2547-1) vThis invention relates to hoists, lifts andjacks,

and supporting yhousings therefor.

The principal object of the invention is to provide in a device of thekind referred to, an elongated, divided housing including complementalbase and cover sections, means for releasably securing the sectionstogether, the sections jointly providing at one end a spring cylinderextended axially and having a rod aperture thru its outer end andafscale slot thru one wall, and at the opposite end a worin gear andsprocket socket, there being spaced sprocket chain slots thru the outerend wall of the socket, and a transversely extended worm-way thru theinner walls of `the said socket, between the spring cylinder and theworm gear and sprocket socket.

Another object is to provide 1n a kind referred to, an elongated,two-part housplemental base yand cover sections, means'for re-l leasablysecuring the sections together, there being interiorly provided at oneend'of the housing an axially extended spring cylinder, and at thesocket for receiving Vaworm gear'and, chain sprocket, there being spacedsprocket chain slots thru the end thereof r)for engaging a sprocketchain, and a transversely extended wormway cutting thru the' inner wallsof the said socket for engaging aworrn forfoperating a gear as refe'rredto' as mounted in thej said socket. e VWith these and such other objectsand advantages in View as may appear in the course of the followingspecification, attention is `now directed to the accompanying drawingswherein is embodiedone preferredf'forin' of our'invention,and wherein 1y i yFigure 1 is aside elevation of thehoist as made andi assembled inaccordance with this iinvenf` 151011, n

Figure 2 is a ure1. M

Figure 3 is a longitudinal section throughv the 4, housing whichcontains the main ,elements of the invention, taken on a planeperpendicular to the section of `Figure -2,r and being considerablyyenlarged. Y. l n

Figure 4 is aside elevation of the assembly 50 shown in Figure 3,-theleft-hand end of the housing being broken away. n i

Figure 5 is a detail plan view, -partly in .section of amedial portionof the housing carryingthe slidably mounted worm lockor'latch; the ends55 ofthe housing 4being broken away.

sectionon'thev 2"-2 of Figdevice of the ing, dividedlongitudinally and:comprising corn opposite end an axially alignedgear andsprocket` Figures is a. section on the une e-e of. Figure 5. `V j Figure I'I is a detailin perspective of onen'of the` bearing blocks, the same being shown confsiderably enlarged. I 5

Figure S isa section on the line 8-8 of Figure 1.

The invention according to the embodiment represented in the presentdrawings, comprises an elongated, sectional or :divided housing, frameor support 1, including what may be termeda base or main section 2 and acap or cover section 3, the two sections being complemental konetothe'otherand being secured or fastened-together by means of set screws4passed into protruding 15 ears lor tabs or flanges 5in a conventionalmannenv In one end of thishousing-is formed the .i springfcylinder 6,the same beingclosed by end walls '7 and 8, except that the'outer endwall' is pierced centrally'or axially bythe pin orI rod` aperture 9..Ihewall offl this spring cylinder is slotted longitudinally; asshovvnat 10,v the same A forming a scale slot, and the adjacent margins oftheslot is scale-marked or calibratedfrom end to end of the slot,` as shownat 11.` Acoil spring 12 is freely seated within thel cylinder V6 andapin or rod 13 is passed `down through' the i end. aperture 9 and throughthe coils;of:the spring,

the inner end of the pin being providedy with a headr or nut 14 adaptedto. seat Vupaga'inst 'a1 30 washer. 15 which `bears upon'the inner endofthe sprin'g 12'. fA pointer 16 extends-from'the washer out throughrthe-slot 10 and is thus arranged to movealong the slot over the scale marksY 11, as the spring 12 expands or contracts.V` The 35 outer end of thepin or rond 13 is formed into a.' hook 17 for engaging a load or asupport, as indiycated at 18 in Figure 1, or for any similarpury pose asmay be required inthe use of the tool;

The opposite end of the housing is formed with 40 a gear andv sprocketsocket or seat 19,` sprocket slots 20 leading out throughftheend,La-transversely` extended wormlway 21 cuttingL through the inner [wallsof ,the socket 19, the bearing block slide-ways 22 ,at the endsofthesaidwormjway, 45

the worm latch slide-Way` 23 alongr the inner margin of the Worm-way andthe spring pockets 24 formed infopposite walls of the socket Y19 inalignment with the slide-ways 22, Within the socket 19 is. rotatablymounted a" unitary as- 50 sembly comprising a short axle 25, a worm gear26 and a sprocket or sprocket wheel 27 .onxthe axle andpreferablyintegrallyformed therewith for the sake of strength. The ends`of ythe axleY are journaled preferably in roller bearings'28" the saidsocket 19.

through oneof the s is squared olf at the end 38 for engaging the slots20 over thesprocket 27, the separator lugy 29 serving for facilitatingthe insertion of the chain and for preventing its becoming lockedLf Thetwo ends of the chain 31 are provided with.V

Work engaging hooks 17a and 17b. A worm 32 is extended through theworm-way 21j; theends thereof being preferably Yjou'rnaled in roller,bearslidable bearingv blocks.` 34,.

ings 33 mounted in which are turned out as shown at 35 to provide thenecessary races for the roller bearing rings. The blocks 34 are formedwith beveled cams 36 which areV turned-' inwardly towards the l latchslideway 23 and arranged to stand in alignment therewith; Oneend of theworm shaft is extendedl out blocks 34, as shown atV 37 and operating1ever'39 .for turning the worm, The blocks 34 are confined againstoutward lateral movement by means of side plates 40` secured in placebyset screws 4l, one of the platesr being `aperturedfas.shownat 42 forpassing the outer end; ofthe worm shaft. i The beveledl or aredformation of the races 35and the bearings 33 seated therein, prevent theinward lateral movef` ment of ,the blocks 34, sothat they are, freetomove'withinf their slide-ways only towards or 19, whereby `the worm `isway and additionally by meansV of a pin 46 seated inthe face oftheslideway and extended recessed toform beveledVv cams 48*complemental tofand adapted to coact with thecams 36 of the blocks 34 forpressingy theYsaid blocksY outwardly againstfthe action of the springs 43, thuscausing the'worm 32'to mesh-with the gear26, as the latch "45 is pushedlinf for that purpose., In such operation the beveled surfaces of therespective cams, which are arranged in properl alignment as shown inFigure 3, ride or slide over one another `upon the inward movement ofthelatch,

thusforcing theblocks 34 outwardly to' the limit ofthe bevels of thecams, after which theladja- Y centsidemargins or edges of thelatchcamsand bearing block cams pass into engagement with` one another, asVindicated at 49 in Figure 3, thus lockingjtheelements n'that xedfrelatin until theV latch is drawn outward again. The outer(ir-operatingV end of the latch 45 is provided; with around shank 50loosely pinned at v5 1 to the. end ofthe latch. Upon this shank isrotatably mounted a knob v52 which is vbored out axially asshown1,990,163v Y i,

at 53 for receiving the shank. 'I'he knob 52 is spring-set to tend toturn in an anti-clockwise diy rection, by means of a coil spring 54seated over the shank and braced or secured at its ends to the knob andshank respectively. A sleeve 55 lis extended laterally from the housing1 in align-v ment with the latch slide-way 23 for vfreely receiving theinner end of the knob'and within which sleeve the knob is adapted torotate. Within this inner end of the knob isformed a U- shaped groove56-56a-56b having its legs openinginwardly towards the housing, theinner vor *bottom side of one leg of this groove being sloped up to forman outwardly disposedr shoulder 57. The arrangement ofthis element isshown in Figure 5.Y The groove 56 isadapted` to engage a spring-set stud58, seated through a bore 59 `formedv throughthesleeve 55 and a laterallug 6()V formed on the sleeve, the outer end of the bore being enlargedand threaded to receive a screw 61 which carries the coil spring62,fthe"1at s ter functioning to force thestudioutwardly into the groove56. The arrangementis such that by rotating the knob 52 clockwiseYwithin the sleeve 55 against the action ofthe springt 54, the slopinglegj56b of the groove 56 may be brought into ,alignment with the stud58, thus permitting the latch45 to be thrust inwardly, in whichoperation the vstudpasses up over the sloped bottom side'of theleg'andsnaps Aback. of

the-shoulder 57, thus locking the latch tofits in,-

ward position. When itis desired to draw the latch kout again, the knobis rotated clockwisey to bring the uniform leg 56a ofl the groove 56into alignment with thestud, which permits `the withdrawal of thelatchas the Vstud travels readily 'through` said groove.` f f In useandoperation as for raising a load;` the housing y1 is 4disposed in .apendant,` manner and the lower hook-17 iswplaced in engagement with theload or work 18. -One of the upper hooks, as 17a, is then placed inengagement with a suit-v able overheadsupport,l represented atgla inFigurel.. By thenrotating the worm `32 in the proper direction, Athroughthe useof thelever 39 appliedto thesquared end 38-of the wormjshaft 37,the sprocket chainr'31 is fedj through the housing 1, passing over thesprocket x27 vand y through the slots 20, whereby the length of 'chain31a is drawn taut and the loadis raised.` After the housing hastraversed the length of chain 31a up to the hook 17a, the length ofchain represented at 31b`is stretched upward and the hook 17b7placed inengagement with the support at a higher point. VVThe hook 17a is thenreleased and by then rotating the worm `32 ina reverse direc.; tion, theload 18 is carried to a higher-point. 'I his process is repeated untilthe load is elevated to the point desired., WhileL the use of the deviceis here illustrated through its application to elevating a. load,y it isobvious that the tool may be readily adapted for moving a load in ahorizontal line as for stretchingline wires orcables orA any similar,use, through the proper arrangement `and engagement of .the severalwork-hooks.

It is 1 apparent f that this tool Vor hoisty possesses very great powerinasmuchas the wormis rotated by a lever at ,great'mechanical advantage,and the worml in turn" ai'ords further mechanical advantage over theAgearand sprocketwheels which pull the'sprocketrchainand attached loads.

Furthermore, the ratio of mechanical movement between the worm and gearis so great thaty the worm serves to lock the gear against any reversemovement, no matter ihow great the load that is being raised or carried,thus enabling each length of chain 17a, or 17h successively to sustainthe load while the other length of chain is being attached to a higheror more advanced point.

Thus the worm may be rotated and the chain caused to travel in eitherdirection through the housing, with equal facility. This provides a stepb-y step mechanism for raising loads` or doing similar work, which ismuch superior vto other conventional devices of the kind. y

For quick readjustment of the chain and hooks, the 'Worm latch isreleased inmanner already pointed out, thereby releasing the worm fromits gear, after which the chain may be rapidly passed through thehousing `ineither direction. The structure is also arranged with theworking elements upon which stresses are imposed, all substantially inaxial alignment, as shown in the drawings, and with the operating leverdisposed laterally at the end of the Worm shaft, in` the most convenientposition.

While we have herein shown and described in a general way a certainpreferred form Orem,- bodiment of our invention and the several elementsand structural features thereof, it is understood that we may varyany'of the elements by employing equivalents thereof, and mayvary orchange any ofthe structural features shown in any matters or details,Within the scope of our invention as defined inthe `appended claims.

We claim:

1. In a device of the kind described, an elongated divided housingincluding a. b-ase section and a cover section, the two sections beingcomplemental one to the other, means for releasably securing the twosections together, the two secj tions of housing providing at theopposite .end a tions jointly providing at one end a spring cylin-y Wormgear and sprocket socket within which ka worm gear and chain sprocketmay be mounted, there being spaced sprocket chainslots leading thru theouter end wall ,thereof and thru which a sprocket chain may be extended,and a transversely extended worm-way cutting thru 'the inner walls ofthe Worm gear and sprocket socket and thru which a worm may be extendedin operative engagement with a Wormgear as referred to as mounted withinthe said worm gear and sprocket socket.

2. In a device of the kind described, an elon gated two-part housing,the same being divided on longitudinal lines and comprising a bas-e secrtion and a cover section, means for releasably securing the two sectionstogether, there being interiorly provided at one end of the two-parthousing a longitudinally extended' spring cylinder, and at the'oppositeend a gear and sprocket socket for receiving a Worm gear and ,chainsprocket, there being spaced sprocket chain slots leading out thru oneend wall thereof thru which a walls of the gear and sprocket socket andthru lwhich a Worm may be extended 'for operating a gear as referred toas mounted within the said gear and sprocket socket.

. JASPER BLACKBURN.

JAMES. WEAVER, JR.

